Study on pore structure and acoustic emission characteristics of Mg(OH)2 modified expired cement

IF 6.2 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Developments in the Built Environment Pub Date : 2024-07-08 DOI:10.1016/j.dibe.2024.100501

Xianyuanning Feng , Xiaolou Chi , Chaolin Wang , Kun Zhang , Li Shaoqi

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引用次数: 0

Abstract

This study investigated the preparation of cementitious mortar specimens (ECM) by blending different dosages of pure magnesium hydroxide (AR), active magnesium oxide, and nano magnesium hydroxide as external additives with expired composite Portland cement. The optimal solution was selected by comparing their “nuclear magnetic resonance” (NMR), mechanical properties, and acoustic emission characteristics. NMR experiments revealed that the addition of 4 wt% nano magnesium hydroxide to expired cement resulted in the largest decrease in harmful pore content in ECM, reaching 21.9%. Mechanical performance testing and acoustic emission monitoring results indicated that the strength of ECM reached a maximum of 21.356 MPa with the addition of 4 wt% nano magnesium hydroxide, representing a 20.2% increase compared to the control group. This suggests that adding 4 wt% nano magnesium hydroxide to expired cement is a preferable option.

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Mg(OH)2 改性过期水泥的孔隙结构和声发射特性研究

本研究通过将不同剂量的纯氢氧化镁（AR）、活性氧化镁和纳米氢氧化镁作为外部添加剂与过期的复合波特兰水泥混合，研究了水泥基砂浆试样（ECM）的制备。通过比较它们的 "核磁共振"（NMR）、机械性能和声发射特性，选出了最佳解决方案。核磁共振实验表明，在过期水泥中添加 4 wt% 的纳米氢氧化镁可使 ECM 中有害孔隙含量的降幅最大，达到 21.9%。机械性能测试和声发射监测结果表明，添加 4 wt%的纳米氢氧化镁后，ECM 的强度达到最大值 21.356 MPa，与对照组相比提高了 20.2%。这表明，在过期水泥中添加 4 wt%的纳米氢氧化镁是一种可取的选择。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Developments in the Built Environment Multiple-

CiteScore

7.40

自引率

1.20%

发文量

审稿时长

22 days

期刊介绍： Developments in the Built Environment (DIBE) is a recently established peer-reviewed gold open access journal, ensuring that all accepted articles are permanently and freely accessible. Focused on civil engineering and the built environment, DIBE publishes original papers and short communications. Encompassing topics such as construction materials and building sustainability, the journal adopts a holistic approach with the aim of benefiting the community.